5661321 has 8 divisors (see below), whose sum is σ = 7732704. Its totient is φ = 3682080.

The previous prime is 5661319. The next prime is 5661343. The reversal of 5661321 is 1231665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5661321 - 2¹ = 5661319 is a prime.

5661321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5661291 and 5661300.

It is not an unprimeable number, because it can be changed into a prime (5661311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22891 + ... + 23136.

It is an arithmetic number, because the mean of its divisors is an integer number (966588).

Almost surely, 2^5661321 is an apocalyptic number.

It is an amenable number.

5661321 is a deficient number, since it is larger than the sum of its proper divisors (2071383).

5661321 is a wasteful number, since it uses less digits than its factorization.

5661321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46071.

The product of its digits is 1080, while the sum is 24.

The square root of 5661321 is about 2379.3530633347. The cubic root of 5661321 is about 178.2266292312.

Adding to 5661321 its reverse (1231665), we get a palindrome (6892986).

It can be divided in two parts, 5661 and 321, that multiplied together give a palindrome (1817181).

The spelling of 5661321 in words is "five million, six hundred sixty-one thousand, three hundred twenty-one".